POST UTME UNIOSUN 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.00 g sample of a hydrocarbon is burned in a bomb calorimeter, relea\sing 12.0 kJ of heat energy. What is the molar mass of the hydrocarbon?
A. 20.0 g/mol
B. 30.0 g/mol
C. 40.0 g/mol
D. 50.0 g/mol
Question 2
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M $\text{HCl}$ is required to reach the equivalence point, what is the number of moles of $\text{NaOH}$ in the solution?
A. 0.00250 mol
B. 0.00500 mol
C. 0.00750 mol
D. 0.0100 mol
Question 3
A diagram of a simple apparatus for measuring the solubility of a gas in a liquid is shown below. If the volume of the gas collected is 500 mL at a pressure of 1000 mmHg and a temperature of 25°C, what is the partial pressure of the gas in the liquid?
A. 800 mmHg
B. 900 mmHg
C. 1000 mmHg
D. 1100 mmHg
Question 4
The diagram below shows a simple apparatus for measuring the solubility of a gas in a liquid. If the volume of the gas collected is 250 mL at a pressure of 750 mmHg and a temperature of 20°C, what is the partial pressure of the gas in the liquid?
A. 600 mmHg
B. 700 mmHg
C. 800 mmHg
D. 900 mmHg
Question 5
Determine the number of moles of $\text{CO}_2$ produced when 2.50 g of $\text{CaC}_2$ is completely decomposed according to the equation: $\text{CaC}_2(s) \rightarrow \text{Ca}(s) + \text{C}(s) + \text{CO}_2(g)$
A. 0.050 mol
B. 0.100 mol
C. 0.150 mol
D. 0.200 mol
Question 6
A 2.0 g sample of a subs\tance is dissolved in 100 mL of water. The resulting solution has a pH of 7.0. What is the molar concentration of the subs\tance?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 7
A 2.5 g sample of a subs\tance is dissolved in 50 mL of water. The resulting solution has a pH of 4.5. What is the molar concentration of the subs\tance?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 8
A polymer is formed from the condensation reaction of ethylene glycol and adipic acid. What is the molecular formula of the polymer?
A. (C2H4O2)n
B. (C6H10O4)n
C. (C4H6O3)n
D. (C3H6O2)n
Question 9
Determine the pH of a 0.1 M solution of hydrochloric acid (HCl) at 25°C. The dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4
Question 10
A 1.0 L solution of a strong acid has a pH of 1.0. What is the concentration of the acid?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M

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